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There are a couple of ways to get your EMT certification. If there's a paramedic program at a community college or the like in your area, they almost certainly offer EMT-Basic classes for credit. Whether those would be accepted at your college or not would depend on your college's policies. When I lived in Boston, Boston University offered an EMT class for credit; there are colleges that offer it.
If you want the cert but don't care about college credits, there are many, many ways to get the card. Hospitals, ambulance companies, and fire departments sometimes open their classes to the public (the first two being far more likely than the last). If you're in a more rural area with volunteer fire/rescue/ambulance departments, they will often give you the class and textbook for free in return for a commitment to volunteer there. That would give you some clinical experience in addition to a free certification that looks good on your app.
Either way, it's hard to go wrong. An EMT certification is a good entry-level qualification that lets you see the nuts and bolts of medicine up close. Plus there's the whole thing about how you could save somebody's life, blah blah blah.
TN schools do not accept EMT-B/IV/P credits as part of a degree in any way. I fought this battle to try and save some cash. No go. It does depend on the school though. I think UAB accepts EMT-P credits. Also check with AACOMAS about if it'll count for that gpa as they compile it independently from your university(ies). I can't remember how that worked.
This definitely varies here in Colorado. I have also fought and fought to have either my Paramedic or my Basic classes recognized and they are most definitely not by University of Colorado. However, Metro State does recognize the credits and in fact has it's own Paramedic program via Denver Health. Hope this helps!